VS: Fix nowarn compiler option to accept warning numbers.

Warning disables are transferred to the VS IDE `<NoWarn>` node.

Fixes: #18878

Source/cmGlobalVisualStudio10Generator.cxx

@@ -1136,6 +1136,8 @@ static unsigned int cmLoadFlagTableSpecial(Json::Value entry,
           value |= cmIDEFlagTable::CaseInsensitive;
         } else if (s == "SpaceAppendable") {
           value |= cmIDEFlagTable::SpaceAppendable;
+        } else if (s == "CommaAppendable") {
+          value |= cmIDEFlagTable::CommaAppendable;
         }
       }
     }

Source/cmIDEFlagTable.h

@@ -29,6 +29,9 @@ struct cmIDEFlagTable
     SpaceAppendable = (1 << 7),     // a flag that if specified multiple times
                                     // should have its value appended to the
                                     // old value with spaces
+    CommaAppendable = (1 << 8),     // a flag that if specified multiple times
+                                    // should have its value appended to the
+                                    // old value with commas (e.g. C# /nowarn
 
     UserValueIgnored = UserValue | UserIgnored,
     UserValueRequired = UserValue | UserRequired

Source/cmIDEOptions.cxx

@@ -148,6 +148,8 @@ void cmIDEOptions::FlagMapUpdate(cmIDEFlagTable const* entry,
     this->FlagMap[entry->IDEName].push_back(new_value);
   } else if (entry->special & cmIDEFlagTable::SpaceAppendable) {
     this->FlagMap[entry->IDEName].append_with_space(new_value);
+  } else if (entry->special & cmIDEFlagTable::CommaAppendable) {
+    this->FlagMap[entry->IDEName].append_with_comma(new_value);
   } else {
     // Use the user-specified value.
     this->FlagMap[entry->IDEName] = new_value;

Source/cmIDEOptions.h

@@ -65,12 +65,22 @@ protected:
       this->derived::operator=(r);
       return *this;
     }
+    FlagValue& append_with_comma(std::string const& r)
+    {
+      return append_with_separator(r, ',');
+    }
     FlagValue& append_with_space(std::string const& r)
+    {
+      return append_with_separator(r, ' ');
+    }
+
+  private:
+    FlagValue& append_with_separator(std::string const& r, char separator)
     {
       this->resize(1);
       std::string& l = this->operator[](0);
       if (!l.empty()) {
-        l += " ";
+        l += separator;
       }
       l += r;
       return *this;

Templates/MSBuild/FlagTables/v10_CSharp.json

@@ -299,11 +299,15 @@
     "flags": []
   },
   {
-    "name":  "DisabledWarnings",
-    "switch": "nowarn",
+    "name":  "NoWarn",
+    "switch": "nowarn:",
     "comment": "",
     "value": "",
-    "flags": []
+    "flags": [
+      "UserValue",
+      "UserRequired",
+      "CommaAppendable"
+    ]
   },
   {
     "name":  "CheckForOverflowUnderflow",

Templates/MSBuild/FlagTables/v11_CSharp.json

@@ -299,11 +299,15 @@
     "flags": []
   },
   {
-    "name":  "DisabledWarnings",
-    "switch": "nowarn",
+    "name":  "NoWarn",
+    "switch": "nowarn:",
     "comment": "",
     "value": "",
-    "flags": []
+    "flags": [
+      "UserValue",
+      "UserRequired",
+      "CommaAppendable"
+    ]
   },
   {
     "name":  "CheckForOverflowUnderflow",

Templates/MSBuild/FlagTables/v12_CSharp.json

@@ -299,11 +299,15 @@
     "flags": []
   },
   {
-    "name":  "DisabledWarnings",
-    "switch": "nowarn",
+    "name":  "NoWarn",
+    "switch": "nowarn:",
     "comment": "",
     "value": "",
-    "flags": []
+    "flags": [
+      "UserValue",
+      "UserRequired",
+      "CommaAppendable"
+    ]
   },
   {
     "name":  "CheckForOverflowUnderflow",

Templates/MSBuild/FlagTables/v140_CSharp.json

@@ -299,11 +299,15 @@
     "flags": []
   },
   {
-    "name":  "DisabledWarnings",
-    "switch": "nowarn",
+    "name":  "NoWarn",
+    "switch": "nowarn:",
     "comment": "",
     "value": "",
-    "flags": []
+    "flags": [
+      "UserValue",
+      "UserRequired",
+      "CommaAppendable"
+    ]
   },
   {
     "name":  "CheckForOverflowUnderflow",

Templates/MSBuild/FlagTables/v141_CSharp.json

@@ -299,11 +299,15 @@
     "flags": []
   },
   {
-    "name":  "DisabledWarnings",
-    "switch": "nowarn",
+    "name":  "NoWarn",
+    "switch": "nowarn:",
     "comment": "",
     "value": "",
-    "flags": []
+    "flags": [
+      "UserValue",
+      "UserRequired",
+      "CommaAppendable"
+    ]
   },
   {
     "name":  "CheckForOverflowUnderflow",

Tests/RunCMake/VS10Project/RunCMakeTest.cmake

@@ -1,5 +1,6 @@
 include(RunCMake)
 
+run_cmake(VsCSharpCompilerOpts)
 run_cmake(ExplicitCMakeLists)
 run_cmake(SourceGroupCMakeLists)
 

Tests/RunCMake/VS10Project/VsCSharpCompilerOpts-check.cmake

@@ -0,0 +1,64 @@
+#
+# Check C# VS project for required elements.
+#
+set(csProjectFile "${RunCMake_TEST_BINARY_DIR}/foo.csproj")
+if(NOT EXISTS "${csProjectFile}")
+  set(RunCMake_TEST_FAILED "Project file ${csProjectFile} does not exist.")
+  return()
+endif()
+
+
+set(inDebug FALSE)
+set(inRelease FALSE)
+set(debugOK FALSE)
+set(releaseOK FALSE)
+
+
+file(STRINGS "${csProjectFile}" lines)
+foreach(line IN LISTS lines)
+  #message(STATUS ${line})
+  if(line MATCHES "^ *<PropertyGroup .*Debug\\|(Win32|x64).*")
+    set(inDebug TRUE)
+  elseif(line MATCHES "^ *<PropertyGroup .*Release\\|(Win32|x64).*")
+    set(inRelease TRUE)
+  elseif(line MATCHES "^ *</PropertyGroup> *$")
+    set(inRelease FALSE)
+    set(inDebug  FALSE)
+  elseif(inDebug AND
+    (line MATCHES "^ *<NoWarn>.*505.*</NoWarn> *$") AND
+    (line MATCHES "^ *<NoWarn>.*707.*</NoWarn> *$") AND
+    (line MATCHES "^ *<NoWarn>.*808.*</NoWarn> *$") AND
+    (line MATCHES "^ *<NoWarn>.*909.*</NoWarn> *$")
+    )
+    set(debugOK TRUE)
+  elseif(inRelease AND
+    (NOT (line MATCHES "^ *<NoWarn>.*505.*</NoWarn> *$")) AND
+    (line MATCHES "^ *<NoWarn>.*707.*</NoWarn> *$") AND
+    (line MATCHES "^ *<NoWarn>.*808.*</NoWarn> *$") AND
+    (line MATCHES "^ *<NoWarn>.*909.*</NoWarn> *$")
+    )
+    set(releaseOK TRUE)
+  endif()
+endforeach()
+
+function(print_csprojfile)
+  file(STRINGS "${csProjectFile}" lines)
+  foreach(line IN LISTS lines)
+    message(STATUS ${line})
+  endforeach()
+endfunction()
+
+
+if(NOT debugOK)
+  message(STATUS "Failed to set Debug configuration warning config correctly.")
+  set(RunCMake_TEST_FAILED "Failed to set Debug configuration defines correctly.")
+  print_csprojfile()
+  return()
+endif()
+
+if(NOT releaseOK)
+  message(STATUS "Failed to set Release configuration warning config correctly.")
+  set(RunCMake_TEST_FAILED "Failed to set Release configuration defines correctly.")
+  print_csprojfile()
+  return()
+endif()

Tests/RunCMake/VS10Project/VsCSharpCompilerOpts.cmake

@@ -0,0 +1,14 @@
+enable_language(CSharp)
+
+add_library(foo SHARED
+  foo.cs)
+
+set_target_properties(foo PROPERTIES
+  LINKER_LANGUAGE CSharp)
+
+
+# Issue 18878
+target_compile_options(foo PRIVATE	"/platform:anycpu" "/nowarn:707,808" "/nowarn:909" )
+
+# Debug only warning disable
+set(CMAKE_CSharp_FLAGS_DEBUG "${CMAKE_CSharp_FLAGS_DEBUG} /nowarn:505")